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Science. 2016 Jan 08;351(6269):151-5. doi: 10.1126/science.aad5845.

A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells.

Science (New York, N.Y.)

David P McMeekin, Golnaz Sadoughi, Waqaas Rehman, Giles E Eperon, Michael Saliba, Maximilian T Hörantner, Amir Haghighirad, Nobuya Sakai, Lars Korte, Bernd Rech, Michael B Johnston, Laura M Herz, Henry J Snaith

Affiliations

  1. Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK.
  2. Helmholtz-Zentrum Berlin für Materialien und Energie, Institute for Silicon Photovoltaics, Kekuléstrasse 5, 12489 Berlin, Germany.

PMID: 26744401 DOI: 10.1126/science.aad5845

Abstract

Metal halide perovskite photovoltaic cells could potentially boost the efficiency of commercial silicon photovoltaic modules from ∼20 toward 30% when used in tandem architectures. An optimum perovskite cell optical band gap of ~1.75 electron volts (eV) can be achieved by varying halide composition, but to date, such materials have had poor photostability and thermal stability. Here we present a highly crystalline and compositionally photostable material, [HC(NH2)2](0.83)Cs(0.17)Pb(I(0.6)Br(0.4))3, with an optical band gap of ~1.74 eV, and we fabricated perovskite cells that reached open-circuit voltages of 1.2 volts and power conversion efficiency of over 17% on small areas and 14.7% on 0.715 cm(2) cells. By combining these perovskite cells with a 19%-efficient silicon cell, we demonstrated the feasibility of achieving >25%-efficient four-terminal tandem cells.

Copyright © 2016, American Association for the Advancement of Science.

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